Question

plot each point and form the triangle abc. verify that the triangle abc is a right triangle. find its area. a = (-4,7) b = (1,5) c = (-1,0)
choose the correct graph that shows points a, b, c, and triangle abc.
to show that the triangle is a right triangle, show that the sum of the squares of the lengths of two of the sides (the legs) equals the square of the length of the third side (the hypotenuse).
find the length of each line segment.
d(a,b)=
d(a,c)=
d(b,c)=
(simplify your answers. type exact answers, using radicals as needed.)

Explanation:

Step1: Recall distance formula

The distance formula between two points $(x_1,y_1)$ and $(x_2,y_2)$ is $d=\sqrt{(x_2 - x_1)^2+(y_2 - y_1)^2}$.

Step2: Calculate $d(A,B)$

For $A(-4,7)$ and $B(1,5)$, we have $x_1=-4,y_1 = 7,x_2=1,y_2 = 5$. Then $d(A,B)=\sqrt{(1-(-4))^2+(5 - 7)^2}=\sqrt{(5)^2+(-2)^2}=\sqrt{25 + 4}=\sqrt{29}$.

Step3: Calculate $d(A,C)$

For $A(-4,7)$ and $C(-1,0)$, we have $x_1=-4,y_1 = 7,x_2=-1,y_2 = 0$. Then $d(A,C)=\sqrt{(-1-(-4))^2+(0 - 7)^2}=\sqrt{(3)^2+(-7)^2}=\sqrt{9+49}=\sqrt{58}$.

Step4: Calculate $d(B,C)$

For $B(1,5)$ and $C(-1,0)$, we have $x_1=1,y_1 = 5,x_2=-1,y_2 = 0$. Then $d(B,C)=\sqrt{(-1 - 1)^2+(0 - 5)^2}=\sqrt{(-2)^2+(-5)^2}=\sqrt{4 + 25}=\sqrt{29}$.

Step5: Verify right - triangle

Check if $d(A,B)^2+d(B,C)^2=d(A,C)^2$. $(\sqrt{29})^2+(\sqrt{29})^2=29 + 29=58=(\sqrt{58})^2$. So it is a right - triangle.

Step6: Calculate area

The area of a right - triangle with legs of lengths $a$ and $b$ is $A=\frac{1}{2}ab$. Here $a = b=\sqrt{29}$, so $A=\frac{1}{2}\times\sqrt{29}\times\sqrt{29}=\frac{29}{2}$.

Answer:

$d(A,B)=\sqrt{29}$, $d(A,C)=\sqrt{58}$, $d(B,C)=\sqrt{29}$, Area $=\frac{29}{2}$